Long-Term Pavement Performance (LTPP) is a research program initiated by the Federal Highway Administration (FHWA) in the United States in the late 1980s. The program aims to study and collect data on the performance of various types of pavement over extended periods of time. The main objectives of LTPP are to improve the understanding of how different pavement designs, materials, construction techniques, and environmental conditions affect pavement performance, longevity, and maintenance needs.
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